Comments on: how-to: ‘usb battery’ v2

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By: Eniac

Eniac — Fri, 10 Jul 2009 20:37:36 +0000

I’m only getting 4.1v from the battery after the current goes through the regulator and my phone doesn’t seem to be charging when i connect it. any ideas?

By: mai

mai — Mon, 25 May 2009 07:34:54 +0000

i have a flash psp but a normal battery. the battery would not charge and it says! charge level 0%, power source-external and battery status – charge complete. please help me

By: ben

ben — Wed, 29 Oct 2008 19:25:47 +0000

need instruction to wire ipod car charger to a usb to download 2g&4g thanks

By: Diego

Diego — Mon, 21 Jan 2008 16:24:59 +0000

If I have 5.7v and i want to plug my 3g Ipod Nano. It will burn or ruin it?

By: Derek

Derek — Thu, 09 Aug 2007 00:12:47 +0000

Hey just a quick couple questions. One do you have to tie pins 2 & 3 to ground as well with the 4th pin. And second when I plug my moto q into it to charge will it show the charging icon on the phone or not. And finally what is the voltage to charge a microsoft zune because it should work since you can charge it with a usb plug on a computer should be able to use that cord just not sure on the voltage.

By: ic_black

ic_black — Mon, 25 Jun 2007 02:36:45 +0000

I have bean wondering if we can use this ‘charger’ to power up other thing, like an wifi usb stick? I tried to power an wifi usb stick with 4 AAs rechargeable batteries (only the the 4 AAs), but it wont work properly, I think it can be lack of power.

By: nkls

nkls — Fri, 08 Jun 2007 21:48:58 +0000

I've found a regulator with this specs:

76S05
V out: 5 V
I out max 2 A
V in max: 35 V

The regulators linked to here has only 1 A output, so I wonder if this can be used, or will it destroy my mp3 player?

By: luke

luke — Mon, 02 Apr 2007 17:55:35 +0000

Hey all. Slightly off topic question. I am getting a guitar with what I assume to be a usb sound card within. makes it possible to connect it to the pc and record with pretty good quality. The guitar also has a headphone out jack, making it possible to listen to your manly licks without bothering anyone else.
the headphone jack only works when attached to a pc.

My question is this. would the aforementioned
powerpack be enough to power the usb sound card to let me use the h-phones without being attached to a pc, and do you think the guitar needs the pc to make the s card work?

By: Drake Brimstone

Drake Brimstone — Tue, 27 Mar 2007 09:31:28 +0000

I recomend adding a diode capable of withstanding a back current greater then the voltage produced by the battery you use between the battery positive connect and the regulator. This prevents accidental reverse current which would fry your regulator. I use a 1N4003 which can withstand 200V Peak inverse voltage, far more then the regulator could handle anyway let alone what a 9V could produce.

By: Giake

Giake — Thu, 01 Mar 2007 06:18:08 +0000

Ok, I’m not very wise in the ways of electronics (I own a Zune, after all) but why won’t the Zune charge off one of these. I haven’t actually constructed this very design, but I’ve essentially run 5 volts into the Zune’s USB cable and nothing happens. From what I can tell, Zune doesn’t need any drivers to just charge. It just needs to recognize that it’s plugged into a computer. Is it possible to charge this thing with a portable device? They want 35 bucks for just an AC charger, so I’d rather make something myself.